Split pulley.



No. 825,982. I PATENTED JULY 17, 1906. H. ROMUNDER.

SPLIT PULLEY.

APPLICATION FILED JUNE 25, 1903.

3 BHEETS-SHEET l.

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PATENTED JULY 17, 1906.

H. ROMUNDBR. SPLIT PULLBY. APPLICATION TILED JUNE 25,1903.

' 3 SHEETS-SHEET 2 O 8 v I O QN\ S w m0 WW W a 1n: NORRIS PETERS co., WASHINGTON, D. c

' N0.825,982. PATENTED JULY 17, 1906.

H. ROMUNDBR.

SPLIT PULLBY. APPLICATION rum) JUNE 25. 1903.

8 SHBETSSHEET 3.

11 1? ass es 1n: "cams rzrzrzs co., wasmrvamu, 04 c UNITED STATES PATENT OFFICE.

SPLIT PULLEY.

Specification of Letters Patent.

Patented July 17, 1906.

Application filed June 25, 1903. Serial No. 163,035.

To all whom, it rrmy concern:

Be it known that I, HERMANN ROMffNDER, a citizen of the United States, and a resident of Bloomsbury, county of Hunterdon, State of New Jersey, have invented certain new and useful Improvements in Split Pulleys, of which the following is a specification.

The object of my invention is to provide a split pulley of unusual strength and durability, combined with lightness of weight, simplicity, and cheapness of construction, which is impervious to moisture and atmospheric influences, thereby preventing the shrinking and swelling to which wood is otherwise subject. To accomplish these objects, I form the rim, spokes, and hub, which the pulley is composed of, out of wood-veneer sheets, each consisting of two or more layers of these veneers of required thickness, the grain of the alternate layers being reversed and all the layers united by a waterproof cementing composition, whereby they form practically one homogeneous plate of wood, impervious to moisture and atmospheric infiuences, and being formed under heat and pressure into a straight or curved plate the same is much stronger and more durable than a considerably thicker board with the grain all running in one direction and will not lose the shape so acquired nor shrink or swell or warp or spread. This construction of the pulley-rim will also prevent the slipping of the belt.

One form of my invention is shown in the accompanying drawings, in which Figure 1 is a perspective view of a pulley embodying my invention. Fig. 2 is a side view of one-half of this pulley. Fig. 3 is a detail of the pulley, showing the inner surface of part of the pulley-rim, the arrangement of the spokes, and part of the hub or nave of the pulley. Fig. 4 shows the outer surface of part of the pulley-rim with perforations for the spoke ends uniformly distributed along and across the surface of the pulley-rim. Figs. 5, 6, and 7 are details showing the three forms of spoke members preferably used in constructing my improved pulley. Fig. 8 is an enlarged section showing the construction of the pulley-rim and spoke and one method of connecting them. Fig. 9 shows an additional spoke member with a single spoke that can be placed at any desired angle by cutting the circular hub end off at any one of the dotted lines shown or at any other line required, leaving an exactly semi-annular piece which may be used as a space-plate.

Same letters indicate similar parts in the different drawings.

The pulley is preferably composed of two sections or halves bolted together by the bolts a a.

A A represent the rim, and B B represent what may be called the center or main spoke members, formed in plates of three, as shown more particularly in Fig. 6.- There are preferably three of such spoke-plates in each of the pulley halves secured to the rim, as shown at b b.

C C and D D are what may be called the auxiliary spoke members, each having two spokes, as more particularly shown in Figs. 5 and 7, respectively. There are preferably two of each of these spoke members in each half of the pulley and their outer ends are joined to the pulley-rim, as shown at b b and b b, respectively. The central or hub portion a c of each spoke member is perforated by a suitable number of holes d d, so that all the spoke members may be held together by bolts e e or other means to form the hub of the pulley. Perforated space-plates f f may be set between the spoke-plates, if desired.

E, Fig. 9, is an extra spoke member which may be inserted at one or more desired points to strengthen the structure.

The rim of the pulley, as well as the spokes, are constructed, as shown in Fig. 8, of a number of layers of wood veneer g h of uniform or different thicknesses, as required, and so arranged as to have the grain of adjacent veneer layers reversed. The number of veneer layers varies according to the size of the pulley and the purposes it is intended for, two or more being used. The different layers are cemented together under heat and pressure by means of any suitable waterproof cementing composition, producing practically one homogeneous plate of wood, impervious to moisture and atmospheric influences, it being understood that the cementing together under heat and pressure of two or more adjacent veneer layers the grain of which runs parallel, while the grain of the remaining layers is reversed, does not change the nature of my invention. The veneerplates forming the rims are than bent to the required radius (curve) and preferably bored or perforated in required distances across and along the surface, the spoke ends fitting into these holes or perforations b b b, as before explained. The veneer plates forming the spoke members, which may be of varying or uniform thickness, are then cut and shaped as re uired, the various spokes being arrange at diflerent angles, as shown in Figs. 5, 6, 7, and 9, which illustrate four of the 'many different shapes these spoke members may form, and either shape of spokes may be used exclusively or together with any one or more of the other shapes, as preferred. The center or hub part of these spoke members, as well as the small space-plates f f, as shown in Fig. 3, made of the same construction and material or otherwise, which together form the hub of the pulley, are so bored and perforated and held firmly together by means of dowels, rivets, or bolts, as shown Figs. 1, 2, and 3, or otherwise, that the spoke ends of the different spoke members connect with the rim at different points along and across the surface of the rim, as shown in Figs. 3 and 4:, by which arrangement the rim is uniformly supported and the pressure evenly distributed all over the surface of the pulleyrim and'taken up by the spokes joined to the rim in certain distances from another and from those of the other spoke members. Two or more, up to any desired number of spoke members and space-plates, may be utilized, according to the width of the pulley and the purposes it is intended for. At the same time these space-plates are not an essential feature of my invention and may be omitted and the spoke members made correspondingly thicker at the center or hub part c instead, so as to fill out the width of the pulleyhub and distribute the spokes across the width of the rim, when the thickness of the spokes may be tapered down toward the rim or not, as desired.

The spoke ends may be more securely fastened by tenons or wedges, as shown in Fig. 8, or by other means. To more securely fasten the pulley-halves together, dowels, tongues, tenons, or other means may be provided in the rim or hub-facings, or both.

It is obvious that by this construction I attain a Wooden pulley of unusual strength combined with unusual lightness of weight.

I claim 1. A pulley composed of two parts comprising semi-annular rim-segments and a series of s oke members arranged in different planes, t e spoke members comprising semiannular hub portions having a plurality of divergent spokes, the spokes of adjacent spoke members extending out in different angles to and connecting with the rim-segments.

2. A pulley composed of two parts comrising semi-annular rim-segments formed of ayers of wood veneer, the layers being united with cement and having the grain reversed, and a series of spoke members arranged in different planes, and formed of layers of wood veneer, the layers being united with cement and having the grain reversed, and the spoke members comprising semi-annular hub portions having a plurality of divergent spokes, the spokes of adjacent spoke members extending out in different angles to and connecting with the rim-segments.

3. A pulley composed of two parts comprising semi-annular rim-segments formed of layers of wood veneer, the layers being united with cement and having the grain reversed, and a series of spoke members arranged in different planes, and formed of layers of wood veneer, the layers being united with cement and having the grain reversed, the central and external spoke members comprising semiannular hub portions having three equidistant spokes radiating outwardly to and connecting with the rim-segment, and the intermediate spoke members comprising semi-annular hub portions having two radial spokes extending out to and connecting with the rim-segments, the angles of said intermediate spokes differing from the angles of the central and external spokes.

4. A pulley composed of two parts comprising semi-annular rim-segments formed of layers of wood veneer, the layers being united with cement and having the grain reversed, and a series of spoke members arranged in difierent planes and formed of layers of wood veneer, the layers being united with cement and having the grain reversed,

the central and external spoke members comprising semiannular hub portions having three equidistant spokes radiating outwardly to and connecting with the rim-segments, and the intermediate spoke members comprising semi-annular hubs having two radial spokes extending out to and connecting with the rim-segment, the angles of said intermediate spokes difiering from the angles of the central and external spokes; together with space-plates comprising semi-annular hub portions disposed between adjacent spoke members.

5. A pulley composed of two parts comprising semi-annular rim-se ments formed of layers of wood veneer, t e layers being united with cement and having the grain reversed, and a series of spoke members arranged in different planes and formed of layers of wood veneer, the layers being united with cement and having the grain reversed, the central and external spoke members comprising semiannular hub portions having three equidistant spokes radiating outwardly to and connecting with a rim-segment, and the intermediate spoke members comprisin semi-annular hub portions having two radia spokes extending out to and connecting with t e rim-segments, the angles of said intermediate spokes differing from the angles of the central and external spokes; together with an additional spoke member whose spoke extends from its hub portion at a desired angle.

6. A pulley composed of two parts comprising semi-annular rim-segments formed of layers of wood veneer, the layers being united with cement and having the grain reversed, and a series of spoke members arranged in different planes, and formed of layers of wood veneer, the layers being united with cement and having the grain reversed, the central and external spoke members comprising semi-annular hub portions, having three equidistant spokes radiating outwardly to and connecting with the rim-segments, and the intermediate spoke members comprising semi-annular hub portions having two radial spokes extending out to and connecting with the rim-segments, the angles of said intermediate spokes differing from the angles of the central and external spokes; and bolts passed transversely through the hub portions of all of said spoke members to unite them.

7. A pulley composed of two parts comprising semi-annular rim-segments formed of layers of wood veneer, the layers being united with cement and having the grain reversed, and a series of spoke members arranged in different planes, and formed of layers of wood veneer, the layers being united with cement and having the grain reversed, the central and external spoke members comprising semiannular hub portions having three equidistant spokes radiating outwardly toand connecting with the rim-segments, and the intermediate spoke members comprising semi-annular hub portions having two radial spokes extending out to and connecting with the rim-segments, the angles of said intermediate spokes differing from the angles of the central and external spokes, and bolts uniting the two parts of the pulley, said bolts being secured between adjacent central and external spoke members of said pulley parts.

HERMANN ROMUNDER.

Witnesses:

JOHN W. OREVELING CARL L. FIEDLER. 

